Battery Management System(1)

 

Battery Management System(1)

Battery Management device (BMS) Design Considerations

There are lot of things that are to be considered while designing a BMS. The complete considerations depend upon the exact stop application in which the BMS could be used. Apart from EV’s BMS are also used anyplace a lithium battery p.C. Is involved together with a sun panel array, windmills, strength partitions and many others. Irrespective of the utility a BMS design need to remember all or many of the following elements.     

Discharging Control: The chief function of a BMS is to hold the lithium cells within the secure running place. For example a standard Lithium 18650 mobile may have an under voltage rating of around 3V. It is the obligation of the BMS to make sure that none of the cells in the percent get discharged beneath 3V.

Charging Control: Separately from the discharging the charging process need to also be monitored via the BMS. Most batteries generally tend to get broken or get decreased in lifespan when charged inappropriately. For lithium battery charger a 2-level charger is used. The first phase is called the Constant Current (CC) throughout which the charger outputs a constant modern to rate the battery. When the battery receives nearly full the second one stage referred to as the Constant Voltage (CV) stage is used throughout which a regular voltage is furnished to the battery at a totally low contemporary. The BMS have to make sure each the voltage and current all through charging does no longer exceed permeable limits as a way to now not over rate or rapid rate the batteries.  The most permissible charging voltage and charging cutting-edge may be discovered in the datasheet of the battery.//

State-of-Charge (SOC) Determination: You can think about SOC because the fuel indicator of the EV. It truely tells us the battery capacity of the p.C. In percent. Just like the one in our mobile smartphone. But it isn't always as clean because it sounds. The voltage and fee/discharge present day of the p.C. Ought to constantly be monitored to expect the ability of the battery. Once the voltage and present is measured there are loads of algorithms that may be used to calculate the SOC of the Battery percent. The maximum generally used method is the coulomb counting technique; we are able to talk more in this later in the article. Measuring the standards and calculating the SOC is also the obligation of a BMS.

State-of-Health (SOC) Determination: The ability of the battery now not only relies upon on its voltage and contemporary profile however also on its age and running temperature. The SOH size tells us about the age and anticipated lifestyles cycle of the battery based totally on its utilization history. This manner we are able to recognize how a whole lot the mileage (distance included after full rate) of the EV reduces because the battery a long time and also we can realize while the battery percent must be replaced. The SOH ought to also be calculated and stored in music by way of the BMS.

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